Parameter optimization and mechanism research of enhanced coagulation treatment for Yuquan River water | Zendy

Qianshu Sun | Zendy; Shuang Zhao | Zendy; Yubo Yan | Zendy; Wenlin Jia | Zendy; Weihua Yang | Zendy

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Parameter optimization and mechanism research of enhanced coagulation treatment for Yuquan River water

Author(s) -

Qianshu Sun,

Shuang Zhao,

Yubo Yan,

Wenlin Jia,

Weihua Yang

Publication year - 2020

Publication title -

water science and technology water supply

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.318

H-Index - 39

eISSN - 1607-0798

pISSN - 1606-9749

DOI - 10.2166/ws.2020.030

Subject(s) - coagulation , turbidity , zeta potential , chemistry , water treatment , flocculation , polyacrylamide , chloride , aluminium sulfate , scanning electron microscope , environmental engineering , environmental chemistry , pulp and paper industry , chemical engineering , environmental science , materials science , biology , nanoparticle , ecology , psychology , organic chemistry , psychiatry , polymer chemistry , engineering , composite material

As one of the drinking water sources for Xuzhou city, Yuquan River has been polluted seriously in recent years. In this paper, enhanced coagulation technology was selected and various parameters (coagulant species, dosage, solution pH and coagulant aid species) were optimized for Yuquan River water treatment. Turbidity and UV254 removal rate were calculated to assess coagulation efficiencies, and meanwhile floc generation kinetics, zeta potential and scanning electron microscope (SEM) spectra were measured to study the coagulation mechanism. Results indicated that the coagulation effect of polyaluminium chloride (PAC) on Yuquan River water was better than that of aluminium sulphate (AS), and its optimal dosage was 20 mg/L. Flocs produced by PAC also exhibited larger size and faster growth velocity than those of AS. Moreover, the applicable initial pH range for Yuquan River was 6.0–9.0, and the optimal coagulation efficiency was observed at pH 7.0. When PAC or AS was selected as coagulant, the application of sodium alginate (SA) could improve turbidity and UV254 removal due to its adsorption bridging role. In addition, coagulation efficiency could be enhanced in an AS coagulation system when polyacrylamide (PAM) was dosed as coagulant aid.

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